Infinitive

Infinitive is a term in linguistics for certain verb forms existing in many languages, most often used as non-finite verbs that do not show a tense. As with many linguistic concepts, there is not a single definition applicable to all languages. The name is derived from Late Latin infinitivus, a derivative of infinitus meaning.
In traditional descriptions of English, the infinitive is the basic dictionary form of a verb when used non-finitely, with or without the particle to. Thus to go is an infinitive, as is go in a sentence like "I must go there". The form without to is called the bare infinitive, and the form with to is called the full infinitive or to-infinitive.
In many other languages the infinitive is a distinct single word, often with a characteristic inflective ending, like cantar in Portuguese, morir in Spanish, manger in French, portare in Latin and Italian, lieben in German, читать in Russian, etc. However, some languages have no infinitive forms. Many Native American languages, Arabic, Asian languages such as Japanese, and some languages in Africa and Australia do not have direct equivalents to infinitives or verbal nouns. Instead, they use finite verb forms in ordinary clauses or various special constructions.
Being a verb, an infinitive may take objects and other complements and modifiers to form a verb phrase. Like other non-finite verb forms, infinitives do not generally have an expressed subject; thus an infinitive verb phrase also constitutes a complete non-finite clause, called an infinitive clause. Such phrases or clauses may play a variety of roles within sentences, often being nouns, and sometimes being adverbs or other types of modifier. Many verb forms known as infinitives differ from gerunds in that they do not inflect for case or occur in adpositional phrases. Instead, infinitives often originate in earlier inflectional forms of verbal nouns. Unlike finite verbs, infinitives are not usually inflected for tense, person, etc. either, although some degree of inflection sometimes occurs; for example Latin has distinct active and passive infinitives.

Phrases and clauses

An infinitive phrase is a verb phrase constructed with the verb in infinitive form. This consists of the verb together with its objects and other complements and modifiers. Some examples of infinitive phrases in English are given below – these may be based on either the full infinitive or the bare infinitive.

sleep
write ten letters
go to the store for a pound of sugar

Infinitive phrases often have an implied grammatical subject making them effectively clauses rather than phrases. Such infinitive clauses or infinitival clauses, are one of several kinds of non-finite clause. They can play various grammatical roles like a constituent of a larger clause or sentence; for example it may form a noun phrase or adverb. Infinitival clauses may be embedded within each other in complex ways, like in the sentence:

I want to tell you that John Welborn is going to get married to Blair.

Here the infinitival clause to get married is contained within the finite dependent clause that John Welborn is going to get married to Blair; this in turn is contained within another infinitival clause, which is contained in the finite independent clause.
The grammatical structure of an infinitival clause may differ from that of a corresponding finite clause. For example, in German, the infinitive form of the verb usually goes to the end of its clause, whereas a finite verb typically comes in second position.

Clauses with implicit subject in the objective case

Following certain verbs or prepositions, infinitives commonly do have an implicit subject, e.g.,

I want them to eat their dinner.
For him to fail now would be a disappointment.

As these examples illustrate, the implicit subject of the infinitive occurs in the objective case in contrast to the nominative case that occurs with a finite verb, e.g., "They ate their dinner."
Such accusative and infinitive constructions are present in Latin and Ancient Greek, as well as many modern languages. The atypical case regarding the implicit subject of an infinitive is an example of exceptional case-marking. As shown in the above examples, the object of the transitive verb want and the preposition for allude to their respective pronouns' subjective role within the clauses.

Marking for tense, aspect and voice

In some languages, infinitives may be marked for grammatical categories like voice, aspect, and to some extent tense. This may be done by inflection, as with the Latin perfect and passive infinitives, or by periphrasis, as with the Latin future infinitives or the English perfect and progressive infinitives.
Latin has present, perfect and future infinitives, with active and passive forms of each. For details see.
English has infinitive constructions that are marked for aspect: perfect, progressive, or a combination of the two. These can also be marked for passive voice :

eat
be eaten
have eaten
have been eaten
be eating
be being eaten
have been eating
have been being eaten

Further constructions can be made with other auxiliary-like expressions, like be going to eat or be about to eat, which have future meaning. For more examples of the above types of construction, see.
Perfect infinitives are also found in other European languages that have perfect forms with auxiliaries similarly to English. For example, avoir mangé means in French.

English

The term infinitive is traditionally applied to the unmarked form of the verb when it forms a non-finite verb, whether or not introduced by the particle to. Hence sit and to sit, as used in the following sentences, would each be considered an infinitive:

I can sit here all day.
I want to sit on the other chair.

The form without to is called the bare infinitive; the form introduced by to is called the full infinitive or to-infinitive.
The other non-finite verb forms in English are the gerund or present participle, and the past participle – these are not considered infinitives. Moreover, the unmarked form of the verb is not considered an infinitive when it forms a finite verb: like a present indicative, subjunctive, or imperative.
Certain auxiliary verbs are modal verbs are complemented by a bare infinitive verb. periphrastic items, such as had better or ought to as substitutes for should, used to as a substitute for did, and be able to for can, are similarly complemented by a bare infinitive verb. Infinitives are negated by simply preceding them with not. Of course the verb do, when complementing a finite verb, occurs as an infinitive. However, the auxiliary verbs have and be often occur as an infinitive: "I should have finished by now"; "It's thought to have been a burial site"; "Let him be released"; "I hope to be working tomorrow."
Huddleston and Pullum's Cambridge Grammar of the English Language does not use the notion of the "infinitive", only that of the infinitival clause, noting that English uses the same form of the verb, the plain form, in infinitival clauses that it uses in imperative and present-subjunctive clauses.
A matter of controversy among prescriptive grammarians and style writers has been the appropriateness of separating the two words of the to-infinitive. For details of this, see split infinitive. Opposing linguistic theories typically do not consider the to-infinitive a distinct constituent, instead regarding the scope of the particle to as an entire verb phrase; thus, to buy a car is parsed like to .

Uses of the infinitive

The bare infinitive and the to-infinitive have a variety of uses in English. The two forms are mostly in complementary distribution – certain contexts call for one, and certain contexts for the other; they are not normally interchangeable, except in occasional instances like after the verb help, where either can be used.
The main uses of infinitives are varied:

Complementing the dummy auxiliary do, e.g., "I do like coffee but I don't care for tea."
In a bare infinitive form as an object complement, i.e.
As a bare infinitive that comprises a phrase rendered in the vestigial permissive mood, e.g. "Let it be."
As a bare infinitive that comprises a phrase rendered as a hortative utterance, e.g. "Let's leave."
As complements of certain fossil phrases such as had better and would rather, in order to, as if to, am to/is to/are to.
As a noun phrase, expressing its action or state in an abstract, general way that functions, e.g. as
Adverbially:
Adjectivally, characterizing a noun, e.g. "a request to see someone" or "the method to use."
In elliptical questions : "I don't know where to go."
In sentence fragment that constitutes an interrogative

The infinitive typically is the dictionary form or citation form of a verb. The form listed in a dictionary entry is the bare infinitive, but the to-infinitive is often used when defining other verbs, e.g.
For further detail and examples of the uses of infinitives in English, see Uses of [English verb forms#Bare infinitive|Bare infinitive] and To-infinitive in the article on uses of English verb forms.

Other Germanic languages

The original Proto-Germanic ending of the infinitive was -an, with verbs derived from other words ending in -jan or -janan.
In German it is -en, with -eln or -ern endings on a few words based on -l or -r roots. The use of zu with infinitives is similar to English to, but is less frequent than in English. German infinitives can form nouns, often expressing abstractions of the action, in which case they are of neuter gender: das Essen means, but also.
In Dutch infinitives also end in -en, sometimes used with te similar to English to, e.g., "Het is niet moeilijk te begrijpen" →. The few verbs with stems ending in -a have infinitives in -n. Afrikaans has lost the distinction between the infinitive and present forms of verbs, with the exception of the verbs wees, which admits the present form is, and the verb hê, whose present form is het.
In North Germanic languages the final -n was lost from the infinitive as early as 500–540 AD, reducing the suffix to -a. Later it has been further reduced to -e in Danish and some Norwegian dialects. In the majority of Eastern Norwegian dialects and a few bordering Western Swedish dialects the reduction to -e was only partial, leaving some infinitives in -a and others in -e. In northern parts of Norway the infinitive suffix is completely lost or only the -a is kept. The infinitives of these languages are inflected for passive voice through the addition of -s or -st to the active form. This suffix appeared in Old Norse as a contraction of mik or sik and originally expressed reflexive actions: kallar + -sik > kallask. The suffixes -mk and -sk later merged into -s, which evolved to -st in the western dialects. The loss or reduction of -a in the active voice in Norwegian did not occur in the passive forms, except for some dialects that have -es. The other North Germanic languages have the same vowel in both forms.

Latin and Romance languages

The formation of the infinitive in the Romance languages reflects that in their ancestor, Latin, almost all verbs had an infinitive ending with -re. For example, in Italian infinitives end in -are, -ere, -rre, or -ire, and in -arsi, -ersi, -rsi, -irsi for the reflexive forms. In Spanish and Portuguese, infinitives end in -ar, -er, or -ir, while similarly in French they typically end in -re, -er, oir, and -ir. In Romanian, both short and long-form infinitives exist; the so-called "long infinitives" end in -are, -ere, -ire and in modern speech are used exclusively as verbal nouns, while there are a few verbs that cannot be converted into the nominal long infinitive. The "short infinitives" used in verbal contexts have the endings -a, -ea, -e, and -i. In Romanian, the infinitive is usually replaced by a clause containing the conjunction să plus the subjunctive mood. The only verb that is modal in common modern Romanian is the verb a putea,. However, in popular speech the infinitive after a putea is also increasingly replaced by the subjunctive.
In all Romance languages, infinitives can also form nouns.
Latin infinitives challenged several of the generalizations about infinitives. They did inflect for voice and for tense, and allowed for an overt expression of the subject. See.
Romance languages inherited from Latin the possibility of an overt expression of the subject. Moreover, the "inflected infinitive" found in Portuguese and Galician inflects for person and number. These, alongside some dialects of Logudorese Sardinian, Old Neapolitan and some modern Southern Italian languages are the only Indo-European languages that allow infinitives to take person and number endings. This helps to make infinitive clauses very common in these languages; for example, the English finite clause in order that you/she/we have... would be translated to Portuguese like para teres/ela ter/termos.... The Portuguese personal infinitive has no proper tenses, only aspects, but tenses can be expressed using periphrastic structures. For instance, "even though you sing/have sung/are going to sing" could be translated to "apesar de cantares/teres cantado/ires cantar".
Other Romance languages allow uninflected infinitives to combine with overt nominative subjects. For example, Spanish al abrir yo los ojos or sin yo saberlo.

Hellenic languages

Ancient Greek

In Ancient Greek the infinitive has four tenses and three voices. Present and perfect have the same infinitive for both middle and passive, while future and aorist have separate middle and passive forms.
Thematic verbs form present active infinitives by adding to the stem the thematic vowel -ε- and the infinitive ending -εν, and contracts to -ειν, e.g., παιδεύ-ειν. Athematic verbs, and perfect actives and aorist passives, add the suffix -ναι instead, e.g., διδό-ναι. In the middle and passive, the present middle infinitive ending is -σθαι, e.g., δίδο-σθαι and most tenses of thematic verbs add an additional -ε- between the ending and the stem, e.g., παιδεύ-ε-σθαι.

Modern Greek

The infinitive per se does not exist in Modern Greek. To see this, consider the ancient Greek ἐθέλω γράφειν. In modern Greek this becomes θέλω να γράψω. In modern Greek, the infinitive has thus changed form and function and is used mainly in the formation of periphrastic tense forms and not with an article or alone. Instead of the Ancient Greek infinitive system γράφειν, γράψειν, γράψαι, γεγραφέναι, Modern Greek uses only the form γράψει, a development of the ancient Greek aorist infinitive γράψαι. This form is also invariable. The modern Greek infinitive has only two forms according to voice: for example, γράψει for the active voice and γραφεί for the passive voice.

Balto-Slavic languages

The infinitive in Russian usually ends in -t' preceded by a thematic vowel, or -ti, if not preceded by one; some verbs have a stem ending in a consonant and change the t to č’, like *mogt' → moč' . Some other Balto-Slavic languages have the infinitive typically ending in, for example, -ć in Polish, -ť in Slovak, -t in Czech and Latvian, -ty in Ukrainian, -ць in Belarusian. Lithuanian infinitives end in -ti, Serbo-Croatian in -ti or -ći, and Slovenian in -ti or -či.
Serbian officially retains infinitives -ti or -ći, but is more flexible than the other Slavic languages in breaking the infinitive through a clause. The infinitive nevertheless remains the dictionary form.
Bulgarian and Macedonian have lost the infinitive altogether except in a handful of frozen expressions where it is the same as the third-person singular aorist form. Almost all expressions where an infinitive may be used in Bulgarian are listed here; nevertheless in all cases a subordinate clause is the more usual form. For that reason, the present first-person singular conjugation is the dictionary form in Bulgarian, while Macedonian uses the third person singular form of the verb in present tense.

Hebrew

has two infinitives, the infinitive absolute and the infinitive construct. The infinitive construct is used after prepositions and is inflected with pronominal endings to indicate its subject or object: , . When the infinitive construct is preceded by the dative preposition, it has a similar meaning to the English to-infinitive, and this is its most frequent use in Modern Hebrew. The infinitive absolute is used for verb focus and emphasis, as in mōṯ yāmūṯ. This usage is commonplace in the Hebrew Bible. In Modern Hebrew it is restricted to high-register literary works.
Note, however, that the Hebrew to-infinitive is not the dictionary form; instead, verbs are traditionally cited in the third-person masculine singular of the suffix conjugation, which is the least marked form.

Finnish

The Finnish grammatical tradition includes many non-finite forms that are generally labeled as infinitives although many of these are functionally converbs. To form the so-called first infinitive, the strong form of the root is used, and these changes occur:

the root is suffixed with -ta/-tä according to vowel harmony
consonant elision takes place if applicable, e.g., juoks+ta → juosta
assimilation of clusters violating sonority hierarchy if applicable, e.g., nuol+ta → nuolla, sur+ta → surra
't' weakens to 'd' after diphthongs, e.g., juo+ta → juoda
't' elides if intervocalic, e.g., kirjoitta+ta → kirjoittaa

As such, it is inconvenient for dictionary use, because the imperative would be closer to the root word. Nevertheless, dictionaries use the first infinitive.
There are also four other infinitives, plus a "long" form of the first:

The long first infinitive is -kse- and must have a personal suffix appended to it. It has the general meaning of, e.g., kirjoittaakseni.
The second infinitive is formed by replacing the final -a/-ä of the first infinitive with e. It can take the inessive and instructive cases to create forms like kirjoittaessa.
The third infinitive is formed by adding -ma to the first infinitive, which alone creates an "agent" form: kirjoita- becomes kirjoittama. The third infinitive is technically a noun, so case suffixes identical to those attached to ordinary Finnish nouns allow for other expressions using the third infinitive, e.g., kirjoittamalla.
* A personal suffix can then be added to this form to indicate the agent participle, such that kirjoittamani kirja =.
The fourth infinitive adds -minen to the first to form a noun that has the connotation of, e.g., kirjoittaminen. It, too, can be inflected like other Finnish nouns that end in -nen.
The fifth infinitive adds -maisilla- to the first, and like the long first infinitive, must take a possessive suffix. It has to do with being and may also imply that the act was cut off or interrupted, e.g., kirjoittamaisillasi. This form is more commonly replaced by the third infinitive in adessive case, usually also with a possessive suffix.

Note that all of these must change to reflect vowel harmony, so the fifth infinitive of hypätä is hyppäämäisillään, not *hyppäämaisillaan.

Seri

The Seri language of northwestern Mexico has infinitival forms used in two constructions. The infinitive is formed by adding a prefix to the stem: either iha- if the complement clause is transitive, or ica- if the complement clause is intransitive. The infinitive shows agreement in number with the controlling subject. Examples are: icatax ihmiimzo, where icatax is the singular infinitive of the verb , and icalx hamiimcajc, where icalx is the plural infinitive. Examples of the transitive infinitive: ihaho , and ihacta .

Translation to languages without an infinitive

In languages without an infinitive, the infinitive is translated either as a that-clause or as a verbal noun. For example, in Literary Arabic the sentence "I want to write a book" is translated as either urīdu an aktuba kitāban or urīdu kitābata kitābin, and in Levantine Colloquial Arabic biddi aktub kitāb.
Even in languages that have infinitives, similar constructions are sometimes necessary where English would allow the infinitive. For example, in French the sentence "I want you to come" translates to Je veux que vous veniez. However, "I want to come" is simply Je veux venir, using the infinitive, just as in English. In Russian, sentences such as "I want you to leave" do not use an infinitive. Rather, the conjunction чтобы is used with the past tense form of the verb : Я хочу, чтобы вы ушли.